stage_cache: use cbmem init hooks

Instead of having the chipset code make the approrpiate
calls at the appropriate places use the cbmem init hooks
to take the appropriate action. That way no chipset code
needs to be changed in order to support the external
stage cache.

Change-Id: If74e6155ae86646bde02b2e1b550ade92b8ba9bb
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/10481
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/include/stage_cache.h

@@ -29,10 +29,6 @@ enum {
 	STAGE_REFCODE,
 };
 
-/* Create an empty stage cache. */
-void stage_cache_create_empty(void);
-/* Recover existing stage cache. */
-void stage_cache_recover(void);
 /* Cache the loaded stage provided according to the parameters. */
 void stage_cache_add(int stage_id, struct prog *stage);
 /* Load the cached stage at given location returning the stage entry point. */